The first two patches were previously reviewed but not yet merged.
These ones need to be merged first as the fourth patch depends on
the changes introduced in them and they also fix bugs seen in
very specific scenarios (running Qemu with hugetlb=on, blob=true
and rebooting guest VM).
The third patch introduces pin_user_pages_fd() API and the fourth
patch shows how the udmabuf driver can make use of it to
longterm-pin the the pages. The last patch adds two new udmabuf
selftests to verify data coherency after potential page migration.
v2:
- Updated the first patch to include review feedback from David and
Jason. The main change in this series is the allocation of page
in the case of hugetlbfs if it is not found in the page cache.
v3:
- Made changes to include review feedback from David to improve the
comments and readability of code
- Enclosed the hugepage alloc code with #ifdef CONFIG_HUGETLB_PAGE
v4:
- Augmented the commit message of the udmabuf patch that uses
pin_user_pages_fd()
- Added previously reviewed but unmerged udmabuf patches to this
series
v5:
- Updated the patch that adds pin_user_pages_fd() to include feedback
from David to handle simultaneous users trying to add a huge page
to the mapping
- Replaced find_get_page_flags() with __filemap_get_folio() in the
second and third patches to ensure that we only obtain head pages
from the mapping
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Dongwon Kim <dongwon.kim@xxxxxxxxx>
Cc: Junxiao Chang <junxiao.chang@xxxxxxxxx>
Vivek Kasireddy (5):
udmabuf: Use vmf_insert_pfn and VM_PFNMAP for handling mmap
udmabuf: Add back support for mapping hugetlb pages (v4)
mm/gup: Introduce pin_user_pages_fd() for pinning shmem/hugetlbfs file
pages (v5)
udmabuf: Pin the pages using pin_user_pages_fd() API (v3)
selftests/dma-buf/udmabuf: Add tests to verify data after page
migration
drivers/dma-buf/udmabuf.c | 96 ++++++++---
include/linux/mm.h | 2 +
mm/gup.c | 114 +++++++++++++
.../selftests/drivers/dma-buf/udmabuf.c | 151 +++++++++++++++++-
4 files changed, 334 insertions(+), 29 deletions(-)
--
2.39.2
